Table 2: Coefficients of the transformation to the standard system for each filter and for each chip. Column 3 gives the number of standard stars used to derive the zero points and the color terms (Cols. 4 and 5), imposing the mean extinction coefficients of La Silla (Col. 6); finally, Col. 7 gives the corresponding average standard errors.
Filter Chip $\char93 $ N. stars Zero point Color term Extinction Av. St. error
V 1 24 $0.987 \pm 0.007$ -0.097 0.14 0.034
  2 306 $1.022 \pm 0.002$ -0.097 0.14 0.031
  3 136 $1.062 \pm 0.003$ -0.097 0.14 0.030
  4 4   -0.097 0.14  
  5 0   -0.097 0.14  
  6 51 $1.095 \pm 0.005$ -0.097 0.14 0.033
  7 67 $1.048 \pm 0.003$ -0.097 0.14 0.022
  8 11 $0.982 \pm 0.007$ -0.097 0.14 0.024

B

 1 25 $0.668 \pm 0.012$ 0.249 0.25 0.053
  2 328 $0.723 \pm 0.002$ 0.249 0.25 0.038
  3 148 $0.772 \pm 0.002$ 0.249 0.25 0.028
  4 4   0.249 0.25  
  5 0   0.249 0.25  
  6 49 $0.810 \pm 0.008$ 0.249 0.25 0.054
  7 56 $0.754 \pm 0.004$ 0.249 0.25 0.030
  8 11 $0.697 \pm 0.019$ 0.249 0.25 0.062

I

 1 22 $1.989 \pm 0.012$ 0.130 0.09 0.056
  2 248 $2.042 \pm 0.002$ 0.130 0.09 0.035
  3 123 $2.063 \pm 0.003$ 0.130 0.09 0.038
  4 6   0.130 0.09  
  5 0   0.130 0.09  
  6 42 $2.072 \pm 0.007$ 0.130 0.09 0.047
  7 47 $2.066 \pm 0.005$ 0.130 0.09 0.033
  8 13 $2.009 \pm 0.007$ 0.130 0.09 0.026


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